MUMBAI, India, Aug. 10 -- Intellectual Property India has published a patent application (202647090044 A) filed by Qualcomm Incorporated on July 24, 2026, for Multiple-Input And Multiple-Output Demodulation For Non-Uniform Modulation Constellations.
Inventors include Taherzadeh Boroujeni, Mahmoud; Yang, Wei; and Luo, Tao.
The application for the patent was published on July 31, 2026, under issue no. 31/2026.
Abstract: Some wireless communications systems modulate signals for transmission via a channel. Probabilistic shaping may utilize non-uniformly distributed modulation constellations to increase spectral efficiency. In some cases, wireless fading may occur in a multiple-input and multiple-output (MIMO) channel, which may cause a loss of the shaping gain from probabilistic shaping. Some examples of approaches to linear MIMO demodulation for probabilistic shaping using auxiliary dimensions are provided. A wireless device may receive information indicating a non-uniform probabilistic distribution of a modulation constellation for a MIMO signal. One or more symbols of the MIMO signal may be transmitted or received via a channel. The wireless device may demodulate the symbol based at least in part on a transformation of the modulation constellation to a subspace using dimensions associated with the non-uniform probabilistic distribution and a point of the transformed modulation constellation nearest to a projected symbol in the subspace.
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